League is not a very welcoming game.
I had a friend who tried to get into League so he could play with me and another friend. This guy is about as casual gamer as it gets. He plays for fun and never cares about ever getting super good no matter what game he plays. He just wants to chat with people and have a good time. He eventually gave up ad moved on. When I asked him why this is what he told me. He told me what I'm sure most of us thought when we started. "What is this?" "Why is this tower doing so much damage?" Stuff like that. However, what made him finally stop playing was the people he was playing with. He said he had never seen such hate towards other people for not doing well and this is coming from a guy who plays a lot of Call of Duty. The worst part about that is that there isn't much Riot can do help that. There is a mute button but that only goes so far. I truly feel for new players. On top of learning the game they also have to deal with smurfs who belittle them for doing poorly. New players that don't quit ether have thick skin, are lucky enough to not run into people like that or are truly insane.